A green method for Mn2+ and NH4+-N removal in electrolytic manganese residue leachate by electric field and phosphorus ore flotation tailings

被引：39

作者：

Deng, Yaling ^{[1
]}

Shu, Jiancheng ^{[1
]}

Lei, Tianya ^{[1
]}

Zeng, Xiangfei ^{[1
]}

Li, Bing ^{[2
]}

Chen, Mengjun ^{[1
]}

机构：

[1] Southwest Univ Sci & Technol, Key Lab Solid Waste Treatment & Resource Recycle, Minist Educ, 59 Qinglong Rd, Mianyang 621010, Sichuan, Peoples R China

[2] Yangtze Normal Univ, Sch Chem & Chem Engn, Chongqing 408100, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2021年 / 270卷

基金：

中国国家自然科学基金;

关键词：

Electrolytic manganese residue leachate; Phosphorus ore flotation tailings; Mn2+; NH4+-N; Removal mechanism; SIMULTANEOUS STABILIZATION/SOLIDIFICATION; ELECTROCHEMICAL DISSOLUTION; AMMONIA NITROGEN; CRYSTALLIZATION; PHOSPHOGYPSUM; RECOVERY; MORPHOLOGY; WATER; GOLD; IRON;

D O I：

10.1016/j.seppur.2021.118820

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

High concentrations of manganese (Mn2+) and ammonia nitrogen (NH4+-N) in electrolytic manganese residue leachate (EMRL) have seriously polluted the environment. In this study, electric field and phosphorus ore flotation tailings (POFTs) were used for Mn2+ and NH4+-N removal in EMRL firstly. The effects of the liquid acid ratios, reaction temperature, current density, initial pH and stable pH of the solution, characteristics of EMRL and POFTs, and removal mechanism of NH4+-N and Mn2+ were investigated. The results indicated that an electric field enhanced the leaching of POFTs and promoted the adsorption and precipitation of Mn2+ and NH4+-N. The concentrations of Mn2+, NH4+-N, PO43- and F- in EMRL were 0.12 mg/L, 9.2 mg/L, 0.09 mg/L, and 0.24 mg/L, respectively, which were within the permitted level for the integrated wastewater discharge standard (GB8978-1996) after adjusting the second stable pH to 10.0. Mn2+ was mostly remove in the form of Mn(OH)(2), MnOOH, Mn-5(OH)(4)(PO4)(2) and MnO2. NH4+-N was mostly remove as NH4MgPO4 center dot 6H(2)O. The phosphate precipitation obtained could be used as market fertilizer. This study provided a new research idea for EMRL harmless disposal and POFTs resource utilization.

引用

页数：13

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